volatile vs fickle

volatile is a noun but fickle is not a noun.

Word	Noun	Adjective	Verb	Adverb
volatile	Yes	Yes	No	No
fickle	No	Yes	No	No

As adjectives, volatile and fickle are synonyms defined as:

volatile and fickle: marked by erratic changeableness in affections or attachments

volatile (noun)	fickle (noun)
a volatile substance; a substance that changes readily from solid or liquid to a vapor

volatile (adjective)	fickle (adjective)
evaporating readily at normal temperatures and pressures	liable to sudden unpredictable change
tending to vary often or widely	marked by erratic changeableness in affections or attachments
marked by erratic changeableness in affections or attachments
liable to lead to sudden change or violence